Stable isotope and chemical composition of pearls: Biomineralization in cultured pearl oysters in Ago Bay, Japan

Hodaka Kawahata, Mayuri Inoue, Masato Nohara, Atsushi Suzuki

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The δ18O, δ13C and trace element composition of pearls collected from Ago Bay, Japan, were investigated in order to evaluate biomineralization in the cultured pearl oyster (Pinctada fucata martensii). The oxygen isotopic data suggest that the pearls were produced around 23-24°C, mainly in June to early July, which is consistent with their occurrence in the field. Therefore the pearls were produced under or close to isotopic equilibrium conditions, although they showed high calcification rates (higher than 0.2-1.0 g cm-2yr-1) under which, for example, coral skeletons (calcification rate ∼0.28 g cm-2yr-1) often show non-equilibrium isotope partitioning. The δ13C values were ∼-2.9‰ lower than those calculated for offshore waters under equilibrium conditions. This may be due to low-δ13C bottom waters resulting from the degradation of organic matter (OM) or to a contribution of low-δ13C food. In the latter case, a simple mass balance calculation gives a respiration component of 14%. Twelve trace elements of bulk pearl samples were classified into four groups on the basis of their enrichment/depletion patterns relative to seawater and inter-element relationships: group 1, Co, Cr, Pb; group 2, Ba, Cs, U; group 3, Cu, Sn, V, and group 4, Mn, Rb, Mo. Comparison with coral skeletons suggests that Ba and Mn (groups 2 and 4) were definitely much enriched in proteinaceous OM relative to aragonite crystals in pearls and that V (group 3) in pearls showed only slight enrichment in the organicrich layer. By contrast, the other elements showed small differences between both layers (enrichment factor of

Original languageEnglish
Pages (from-to)405-412
Number of pages8
JournalJournal of Oceanography
Volume62
Issue number4
DOIs
Publication statusPublished - Aug 2006
Externally publishedYes

Fingerprint

biomineralization
stable isotope
calcification
chemical composition
skeleton
coral
trace element
organic matter
aragonite
bottom water
mass balance
respiration
partitioning
isotope
crystal
seawater
oxygen
degradation
food
water

Keywords

  • Biomineralization
  • Calcification
  • Carbon and oxygen isotopes
  • Coral skeletons
  • Pearl oyster
  • Pearls

ASJC Scopus subject areas

  • Oceanography

Cite this

Stable isotope and chemical composition of pearls : Biomineralization in cultured pearl oysters in Ago Bay, Japan. / Kawahata, Hodaka; Inoue, Mayuri; Nohara, Masato; Suzuki, Atsushi.

In: Journal of Oceanography, Vol. 62, No. 4, 08.2006, p. 405-412.

Research output: Contribution to journalArticle

@article{f8c3584b074148edb412304c940f38a2,
title = "Stable isotope and chemical composition of pearls: Biomineralization in cultured pearl oysters in Ago Bay, Japan",
abstract = "The δ18O, δ13C and trace element composition of pearls collected from Ago Bay, Japan, were investigated in order to evaluate biomineralization in the cultured pearl oyster (Pinctada fucata martensii). The oxygen isotopic data suggest that the pearls were produced around 23-24°C, mainly in June to early July, which is consistent with their occurrence in the field. Therefore the pearls were produced under or close to isotopic equilibrium conditions, although they showed high calcification rates (higher than 0.2-1.0 g cm-2yr-1) under which, for example, coral skeletons (calcification rate ∼0.28 g cm-2yr-1) often show non-equilibrium isotope partitioning. The δ13C values were ∼-2.9‰ lower than those calculated for offshore waters under equilibrium conditions. This may be due to low-δ13C bottom waters resulting from the degradation of organic matter (OM) or to a contribution of low-δ13C food. In the latter case, a simple mass balance calculation gives a respiration component of 14{\%}. Twelve trace elements of bulk pearl samples were classified into four groups on the basis of their enrichment/depletion patterns relative to seawater and inter-element relationships: group 1, Co, Cr, Pb; group 2, Ba, Cs, U; group 3, Cu, Sn, V, and group 4, Mn, Rb, Mo. Comparison with coral skeletons suggests that Ba and Mn (groups 2 and 4) were definitely much enriched in proteinaceous OM relative to aragonite crystals in pearls and that V (group 3) in pearls showed only slight enrichment in the organicrich layer. By contrast, the other elements showed small differences between both layers (enrichment factor of",
keywords = "Biomineralization, Calcification, Carbon and oxygen isotopes, Coral skeletons, Pearl oyster, Pearls",
author = "Hodaka Kawahata and Mayuri Inoue and Masato Nohara and Atsushi Suzuki",
year = "2006",
month = "8",
doi = "10.1007/s10872-006-0064-4",
language = "English",
volume = "62",
pages = "405--412",
journal = "Journal of Oceanography",
issn = "0916-8370",
publisher = "Springer Netherlands",
number = "4",

}

TY - JOUR

T1 - Stable isotope and chemical composition of pearls

T2 - Biomineralization in cultured pearl oysters in Ago Bay, Japan

AU - Kawahata, Hodaka

AU - Inoue, Mayuri

AU - Nohara, Masato

AU - Suzuki, Atsushi

PY - 2006/8

Y1 - 2006/8

N2 - The δ18O, δ13C and trace element composition of pearls collected from Ago Bay, Japan, were investigated in order to evaluate biomineralization in the cultured pearl oyster (Pinctada fucata martensii). The oxygen isotopic data suggest that the pearls were produced around 23-24°C, mainly in June to early July, which is consistent with their occurrence in the field. Therefore the pearls were produced under or close to isotopic equilibrium conditions, although they showed high calcification rates (higher than 0.2-1.0 g cm-2yr-1) under which, for example, coral skeletons (calcification rate ∼0.28 g cm-2yr-1) often show non-equilibrium isotope partitioning. The δ13C values were ∼-2.9‰ lower than those calculated for offshore waters under equilibrium conditions. This may be due to low-δ13C bottom waters resulting from the degradation of organic matter (OM) or to a contribution of low-δ13C food. In the latter case, a simple mass balance calculation gives a respiration component of 14%. Twelve trace elements of bulk pearl samples were classified into four groups on the basis of their enrichment/depletion patterns relative to seawater and inter-element relationships: group 1, Co, Cr, Pb; group 2, Ba, Cs, U; group 3, Cu, Sn, V, and group 4, Mn, Rb, Mo. Comparison with coral skeletons suggests that Ba and Mn (groups 2 and 4) were definitely much enriched in proteinaceous OM relative to aragonite crystals in pearls and that V (group 3) in pearls showed only slight enrichment in the organicrich layer. By contrast, the other elements showed small differences between both layers (enrichment factor of

AB - The δ18O, δ13C and trace element composition of pearls collected from Ago Bay, Japan, were investigated in order to evaluate biomineralization in the cultured pearl oyster (Pinctada fucata martensii). The oxygen isotopic data suggest that the pearls were produced around 23-24°C, mainly in June to early July, which is consistent with their occurrence in the field. Therefore the pearls were produced under or close to isotopic equilibrium conditions, although they showed high calcification rates (higher than 0.2-1.0 g cm-2yr-1) under which, for example, coral skeletons (calcification rate ∼0.28 g cm-2yr-1) often show non-equilibrium isotope partitioning. The δ13C values were ∼-2.9‰ lower than those calculated for offshore waters under equilibrium conditions. This may be due to low-δ13C bottom waters resulting from the degradation of organic matter (OM) or to a contribution of low-δ13C food. In the latter case, a simple mass balance calculation gives a respiration component of 14%. Twelve trace elements of bulk pearl samples were classified into four groups on the basis of their enrichment/depletion patterns relative to seawater and inter-element relationships: group 1, Co, Cr, Pb; group 2, Ba, Cs, U; group 3, Cu, Sn, V, and group 4, Mn, Rb, Mo. Comparison with coral skeletons suggests that Ba and Mn (groups 2 and 4) were definitely much enriched in proteinaceous OM relative to aragonite crystals in pearls and that V (group 3) in pearls showed only slight enrichment in the organicrich layer. By contrast, the other elements showed small differences between both layers (enrichment factor of

KW - Biomineralization

KW - Calcification

KW - Carbon and oxygen isotopes

KW - Coral skeletons

KW - Pearl oyster

KW - Pearls

UR - http://www.scopus.com/inward/record.url?scp=33746093476&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33746093476&partnerID=8YFLogxK

U2 - 10.1007/s10872-006-0064-4

DO - 10.1007/s10872-006-0064-4

M3 - Article

AN - SCOPUS:33746093476

VL - 62

SP - 405

EP - 412

JO - Journal of Oceanography

JF - Journal of Oceanography

SN - 0916-8370

IS - 4

ER -